7.2 and 7.3

Question 1

movement of a substance down its concentration gradient

Answer 1

diffusion

Question 2

substances crossing the cell membrane down their concentration gradients

Answer 2

passive transport

Question 3

small, nonpolar molecules passing directly through the lipid bilayer

Answer 3

simple diffusion

Question 4

transport proteins helping ions and polar molecules go through cell

Answer 4

facilitated diffusion

Question 5

types of passive transport

Answer 5

diffusion
simple diffusion
facilitated diffusion
osmosis

Question 6

process of water diffusing across the cell membrane

Answer 6

osmosis

Question 7

basic structure of a biological membrane, composed of 2 layers of phospholipids

Answer 7

lipid bilayer

Question 8

a lipid that contains phosphorus and that is a structural component in cell membranes

Answer 8

phospholipid

Question 9

the arrangement of phospholipids in the lipid bilayer

allows only certain substances to pass through

Answer 9

selectively permeable

semipermeable

Question 10

solution with high concentration of solute compared to cell

Answer 10

hypertonic

Question 11

solution with low concentration of solute compared to cell

Answer 11

hypotonic

Question 12

concentrations of solute and water in solution are equal to those in the cell

Answer 12

isotonic

Question 13

movement of water in:
hypertonic
hypotonic
isotonic

Answer 13

out of cell - shrinks
into cell - swells and may burst
back and forth - same size

Question 14

to move a substance against its concentration gradient

Answer 14

active transport

Question 15

requires energy

Answer 15

active transport

Question 16

uses carrier proteins

Answer 16

active transport

passive transport

Question 17

low to high concentration

Answer 17

active transport

Question 18

high to low concentration

Answer 18

passive transport

Question 19

moves products into, out of, or within cell

Answer 19

vesicles

Question 20

a cell uses vesicles to move materials into the cell

Answer 20

endocytosis

Question 21

a cell uses vesicles to move materials out of the cell

Answer 21

exocytosis

Question 22

functions of proteins in cellular membranes

Answer 22

transports substances
identifies cells
detects surroundings

Question 23

when the concentration of a substance is the same throughout a space

Answer 23

equilibrium

Question 24

Parts of phospholipid molecule

Answer 24

hydrophilic head - phosphate head - polar - outside

hydrophobic tail - fatty acid tail - nonpolar - inside